Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 10.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 07/12/2023   07:34:25   (  70.04,  62.49) 07/12/2023   07:35:05  (  70.01,  62.48)    2.85                40
 07/12/2023   08:25:06   ( -69.89,-129.97) 07/12/2023   08:24:35  ( -69.90,-130.05)    3.10                31
 07/14/2023   23:00:48   ( -70.87,   9.64) 07/14/2023   23:01:56  ( -70.76,  11.82)   80.56                68
 07/14/2023   23:51:17   (  69.98, 178.36) 07/14/2023   23:51:35  (  70.01, 178.35)    3.02                18
 07/15/2023   00:41:59   ( -69.88, -14.18) 07/15/2023   00:41:05  ( -69.89, -14.17)    1.59                54
 07/17/2023   15:17:26   ( -70.08, 126.67) 07/17/2023   15:18:38  ( -70.08, 126.70)    1.13                72
 07/17/2023   16:08:10   (  69.98, -65.86) 07/17/2023   16:08:05  (  69.98, -65.81)    2.18                 5
 07/17/2023   16:58:50   ( -69.77, 101.76) 07/17/2023   16:57:36  ( -69.81, 101.60)    7.98                74
 07/20/2023   07:34:18   ( -70.03,-117.47) 07/20/2023   07:35:08  ( -70.04,-117.48)    1.28                50
 07/20/2023   08:25:01   (  69.93,  49.99) 07/20/2023   08:24:34  (  69.93,  50.01)    0.96                27
 07/20/2023   09:15:26   ( -68.92,-141.26) 07/20/2023   09:14:19  ( -69.00,-143.61)   94.15                67
 07/22/2023   23:51:09   ( -69.98,  -1.63) 07/22/2023   23:51:37  ( -69.97,  -1.68)    2.48                28
 07/23/2023   00:41:53   (  69.89, 165.83) 07/23/2023   00:41:04  (  69.86, 165.80)    3.14                49